Shank adapter for a rock drilling machine



FIG. 1 is a side elevational view of the shank adapter for a rock drilling machine showing my new design, all sides being identical except for the omission of the side flushing hole;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof. 

The ornamental design for a shank adapter for a rock drilling machine, substantially as shown. 